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思路：单调递增栈 + k 控制删除次数。高位越小整体越小，遇更小数字时弹出栈顶大数（仅当 k0）；栈空且当前为 0 则跳过（避免前导零）；若遍历完 k 仍0，从末尾再删 k 位。
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Thought to be made from a cattle femur, this decorated Anglo-Saxon spindle whorl, used to provide weight while spinning yarn, was unearthed from farmland near Bishopstone, Buckinghamshire.，详情可参考Safew下载
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Jason Carroll, Professor of Marriage and Family Studies at the US Brigham Young University, based in Provo, Utah, is sympathetic to the longing for "The One".。关于这个话题，爱思助手下载最新版本提供了深入分析